1、Large and middle scale enterprise website characteristic
　　The large and middle scale enterprise website mainly on the Internet issues the company introduces, the product information, the propaganda company serves, the contact method, advertises for content and so on talented person, and collection user feedback information. Through the enterprise website, the enterprise may effectively develop the service, and may carry on the effective communication and the commercial intercourse in the domestic and foreign partner. Its website main characteristic as follows:
　 1）Take the static page as the focus
　 2）The column are many, the content are many, the information content is big
　 3）The product picture request is extremely clear, therefore the picture document is big
　 4）Requests the website to be broad the audiences, arrives the good propaganda goal

2、The current website faces main question
　　Initial period constructs which in the Chinese Internet, because plans, reason and so on investment, when China's telecommunication operation business in lays down the Internet backbone line, put with emphasis on some key cities or the area, in some two levels of cities or farther away area, Internet backbone line or unusual narrow. These local band width resources appear extremely anxiously, the Internet user accesses the net the experience is very bad, opens one website must spend the very long time, even absolutely does not hit the website.
　　According to the former Internet construction and the application experience, on the Internet application throughout in advance to the infrastructure construction, the website technology from the initial static homepage, to afterwards the dynamic page, as well as now more popular some interactions, flash or flows the media technology, was more and more high to the band width request, but the backbone network infrastructure lag as well as last kilometer expense soaring, seriously affected the website new technology application and the promotion. On the one hand, the website longs for the new technical energy band comes the new service income, on the other hand, the Internet user hopes enjoys the new technology brings new service pattern, work life study convenience as well as other richer network application. But in fact the traditional network structure and the website content issues the way restricts all these.
　　Moreover, divides family property after the Chinese telecommunication north and south, the Internet backbone network by one divides into two, north was also had the Chinese net passes, south had the Chinese telecommunication. Now the very many nets people reflects, some frequently visits the website speed changes unusual slow, even cannot visit. North 10 provinces and the local Internet users visit the Chinese net passes IDC when the website can be extremely quick, when but visits Chinese telecommunication IDC the website, feels extremely slowly, even does not hit. Except the north and south exchange visits difficult question, the website owner or the superintendent also changes the unusual difficulty to the website management and the maintenance, after the page renews wants above to pass on to the server needs to spend the very long time, the website not to result in the prompt renewal. These questions appearances greatly reduced the domestic website response speed, the information grade of service and the network promotion effect. After has this kind of question main reason is the Chinese telecommunication divides family property, two big telecommunication operations business in interlocks exchanges above has a bigger difference, thereupon appeared in the north and south exchange visits route bottleneck, although the information industry department in coordinated with every effort, but estimated in the quite long one period of time, the north and south exchange visits slow question also could exist.
　　Because the above question existence, causes the large and middle scale enterprise in carries on when the network promotion met the very many questions. The website does not hit, the company information, the product information cannot transmit gives the customer, very possibly causes the customer confidence to lose as well as to enterprise sympathy reduce. Brought the very tremendous influence for the large and middle scale enterprise service development.

3、Solution
　　In view of the present China Internet infrastructure lag, the new application unceasingly appears as well as the north and south exchanges the existence question, one kind of intellectualized content distribution technology and the solution arises at the historic moment, this is the CDN solution.
　　1）CDN function:
　 ·CDN can enhance the stand the performance and the reliability, it allows the network content to locate most approaches the terminal user the position, and may the smallest source server load and the transmission delay time.
　 ·It eliminated the Internet jam spot, the permission rich content effective transmission, caused the video frequency and other rich contents transmission into possible at the same time, actually had not reduced the stand the performance.
　 ·The CDN plan optimized the expensive stand band width, eliminated to passes a more expensive network the content demand.
　 ·Protection source server
　　2）Website income:
　 ·Will enhance customer satisfaction - frequently the network content which visited is transmitted on own initiative to the distance user nearer CDN pitch point may reduce the website response time, eliminates " did not look for the server " mistake.
　 ·Enhances the user the loyalty.
　 ·The website needs not to invest the expensive each kind of server, the establishment minute stand.
　 ·The website only needs to maintain the content, does not need to consider the current capacity question, enhanced the band width utilization ratio. Both saved the cost, and enhanced the efficiency.
　 ·The website may propose the Gauguin many new services, and provides the even better grade of service, sharpened the competition ability.
　 ·Strengthened optimizes the network content tenderer high priority network content, the application software and the enterprise to the Web resources control management - enhancement management function plans, causes them to obtain biggest profit. Improved the working efficiency.
　　3）CDN basic principle of work
　　The CDN basic principle of work is widely uses each kind of Cache server, distributes these Cache server the user visit relative centralism in the area or the network, and uses the global technology (GSLB) user's visit direction to the user recent work normal Cache server on, directly responds the user by it the request. If in the Cache server does not have the content which user must visit, it can act according to disposes as automatically captures the corresponding page as the original server and provides to the user. May say, after once the CDN network normal movement, the content distribution and user's visit locates completely is automatic.
　　The network content distribution and the transmission service provided one kind of intellectualized solution, it allowed the specific network content which requested according to the user the static network content transmission to give the terminal user. Based on the service network content distribution and the transmission service may with the Web high speed buffer storage together, retransmit the user regarding the static network content request to includes this network content transcription the distance recent CDN pitch point, thus may avoid through Internet connecting provides this network content the source server. Frequently the network content which visits can duplicate in the many estimates visit quantity very big CDN pitch point. The CDN service provides the chamber of commerce provides one content issue way, may let the network content provide the business fast transmits own network content for the CDN pitch point, and nearby transmits to the goal user, but does not need the network content provides discusses own founds one special network content distribution network, therefore this method already obtained the market universal welcome.